2014ApJ...792L...1Y


Query : 2014ApJ...792L...1Y

2014ApJ...792L...1Y - Astrophys. J., 792, L1 (2014/September-1)

The discovery of radio stars within 10'' of Sgr A* at 7 mm.

YUSEF-ZADEH F., ROBERTS D.A., BUSHOUSE H., WARDLE M., COTTON W., ROYSTER M. and VAN MOORSEL G.

Abstract (from CDS):

Very Large Array observations of the Galactic center at 7 mm have produced an image of the 30'' surrounding Sgr A* with a resolution of ∼82x42 milliarcseconds (mas). A comparison with IR images taken simultaneously with the Very Large Telescope identifies 41 radio sources with L-band (3.8 µm) stellar counterparts. The well-known young, massive stars in the central Sgr A* cluster (e.g., IRS 16C, IRS 16NE, IRS 16SE2, IRS 16NW, IRS 16SW, AF, AFNW, IRS 34W, and IRS 33E) are detected with peak flux densities between ∼0.2 and 1.3 mJy. The origin of the stellar radio emission in the central cluster is discussed in terms of ionized stellar winds with mass-loss rates in the range ∼0.8-5x10–5 M/yr. Radio emission from eight massive stars is used as a tool for registration between the radio and infrared frames with mas precision within a few arcseconds of Sgr A*. This is similar to the established technique of aligning SiO masers and evolved stars except that radio stars lie within a few arcseconds of Sgr A*. Our data show a scatter of ∼6.5 mas in the positions of the eight radio sources that appear in both the L-band and 7 mm images. Last, we use the radio and IR data to argue that members of IRS 13N are young stellar objects rather than dust clumps, supporting the hypothesis that recent star formation has occurred near Sgr A*.

Abstract Copyright:

Journal keyword(s): galaxies: active - Galaxy: center - ISM: jets and outflows - radio continuum: stars - stars: early-type

Nomenclature: Table 1: [YRB2014] NN (Nos 1-41).

Simbad objects: 62

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Number of rows : 62
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4078 2
2 QSO B1730-130 QSO 17 33 02.7055087032 -13 04 49.545516612   18 18.5 18.78 17.39 ~ 1059 1
3 QSO J1744-3116 Bla 17 44 23.57824 -31 16 36.2943           ~ 139 1
4 GCIRS 11 * 17 45 39.389 -29 00 14.89           M7III 22 0
5 [YRB2014] 38 * 17 45 39.4051 -29 00 27.015           ~ 1 0
6 [BSD96] 29 WR* 17 45 39.46 -29 00 31.7           WN8 28 0
7 GCIRS 6 * 17 45 39.5 -29 00 27           ~ 36 0
8 [BSD96] 33 WR* 17 45 39.54 -29 00 35.0           Ofpe/WN9 40 0
9 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12988 0
10 [YRB2014] 37 * 17 45 39.6239 -29 00 26.602           ~ 2 0
11 GCIRS 13E Cl* 17 45 39.73 -29 00 29.7           WN9 110 0
12 GCIRS 34W WR* 17 45 39.73 -29 00 26.6           Ofpe/WN9 56 0
13 GCIRS 13 Em* 17 45 39.76 -29 00 29.8           ~ 133 0
14 [YRB2014] 36 * 17 45 39.7756 -29 00 31.897           ~ 2 0
15 [YRB2014] 35 * 17 45 39.7786 -29 00 29.568           ~ 2 0
16 GCIRS 13E5 IR 17 45 39.780 -29 00 29.65           ~ 11 0
17 [YRB2014] 33 * 17 45 39.7941 -29 00 29.617           ~ 2 0
18 [YRB2014] 34 * 17 45 39.7943 -29 00 29.784           ~ 2 0
19 [YRB2014] 28 * 17 45 39.7987 -29 00 29.010           ~ 2 0
20 GCIRS 13E2 WR* 17 45 39.8006 -29 00 29.819           WN8 42 0
21 GCIRS 13E3 ** 17 45 39.8038 -29 00 29.627           ~ 28 1
22 [YRB2014] 24 * 17 45 39.8062 -29 00 29.274           ~ 2 0
23 [YRB2014] 29 * 17 45 39.8075 -29 00 28.985           ~ 1 0
24 [YRB2014] 25 * 17 45 39.8083 -29 00 29.161           ~ 1 0
25 [YRB2014] 26 * 17 45 39.8094 -29 00 29.070           ~ 1 0
26 [YRB2014] 30 * 17 45 39.8108 -29 00 29.811           ~ 2 0
27 GCIRS 13N * 17 45 39.812 -29 00 29.16           ~ 37 0
28 [YRB2014] 22 * 17 45 39.8162 -29 00 29.451           ~ 2 0
29 GCIRS 13E1 s*b 17 45 39.8166 -29 00 29.730           B0/1I 32 0
30 [YRB2014] 31 * 17 45 39.8171 -29 00 29.831           ~ 1 0
31 [YRB2014] 27 * 17 45 39.8173 -29 00 29.030           ~ 1 0
32 [YRB2014] 23 * 17 45 39.8181 -29 00 29.285           ~ 2 0
33 [YRB2014] 21 * 17 45 39.8198 -29 00 29.505           ~ 2 0
34 [YRB2014] 32 * 17 45 39.8250 -29 00 29.783           ~ 2 0
35 [YRB2014] 19 * 17 45 39.8319 -29 00 29.530           ~ 1 0
36 [YRB2014] 20 * 17 45 39.8382 -29 00 29.426           ~ 2 0
37 [MES2007] X3 * 17 45 39.8478 -29 00 30.445           ~ 16 0
38 [YRB2014] 17 * 17 45 39.8927 -29 00 30.045           ~ 1 0
39 [YRB2014] 18 * 17 45 39.9004 -29 00 30.016           ~ 2 0
40 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 330 0
41 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3892 3
42 GCIRS 16NW WR* 17 45 40.0451 -29 00 26.847           Ofpe/WN9 130 0
43 GCIRS 33E WR* 17 45 40.0941 -29 00 31.213           Ofpe/WN9 53 0
44 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 176 1
45 GCIRS 16SW WR* 17 45 40.1245 -29 00 29.018           Ofpe/WN9 150 0
46 [YRB2014] 11 * 17 45 40.2095 -29 00 30.696           ~ 1 0
47 [YRB2014] 12 * 17 45 40.2183 -29 00 30.845           ~ 1 0
48 [YRB2014] 13 * 17 45 40.2194 -29 00 30.742           ~ 1 0
49 GCIRS 21 WR* 17 45 40.222 -29 00 30.85           WC9 98 0
50 [YRB2014] 15 * 17 45 40.2254 -29 00 30.718           ~ 1 0
51 [YRB2014] 14 * 17 45 40.2258 -29 00 30.705           ~ 1 0
52 GCIRS 35W WR* 17 45 40.26 -29 00 29.3           WN5/6 43 0
53 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 146 0
54 [YRB2014] 40 * 17 45 40.4370 -29 00 27.463           ~ 1 0
55 [YRB2014] 41 * 17 45 40.4398 -29 00 27.597           ~ 1 0
56 GCIRS 1W Em* 17 45 40.442 -29 00 27.51           Be? 101 0
57 [YRB2014] 9 * 17 45 40.6938 -29 00 18.268           ~ 2 0
58 [YRB2014] 10 * 17 45 40.6956 -29 00 18.179           ~ 1 0
59 GCIRS 5 * 17 45 40.700 -29 00 18.51           ~ 56 0
60 GCIRS 4 * 17 45 40.837 -29 00 34.16           ~ 21 0
61 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 687 0
62 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 493 0

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2022.07.03-19:22:32

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